In this post 8 image loading optimization techniques are outlined to minimize both the bandwidth used for loading images on the web and the CPU usage for image display.
PHP
Laravel Deadlocks: Queue Jobs That Already Ran End Up in failed_jobs
Below MySQL 8.0.1, or on a server Laravel misreads, workers reserve jobs with a plain FOR UPDATE and can deadlock on the DELETE. One tinker line shows which lock yours use. Read more